/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.gateway.shell.hdfs;
import org.apache.commons.io.FileUtils;
import org.apache.hadoop.gateway.shell.AbstractRequest;
import org.apache.hadoop.gateway.shell.BasicResponse;
import org.apache.hadoop.gateway.shell.Hadoop;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.Callable;
public class Get {
static class Request extends AbstractRequest<Response> {
private String from;
private String to;
Request( Hadoop session ) {
super( session );
}
public Request from( String file ) {
this.from = file;
return this;
}
public Request file( String file ) {
this.to = file;
return this;
}
protected Callable<Response> callable() {
return new Callable<Response>() {
@Override
public Response call() throws Exception {
URIBuilder uri = uri( Hdfs.SERVICE_PATH, from );
addQueryParam( uri, "op", "OPEN" );
HttpGet request = new HttpGet( uri.build() );
return new Response( execute( request ), to );
}
};
}
}
static class Response extends BasicResponse {
Response( HttpResponse response, String to ) throws IOException {
super( response );
if( to != null ) {
FileUtils.copyInputStreamToFile( getStream(), new File( to ) );
}
}
}
}